On 11/11/17 16:59, John Rumm wrote:Thanks John.
> On 11/11/2017 11:44, Tim Watts wrote:
>> I've balancing my new CH - noticed the flow and return to the boiler
>> were virtually the same - and the auto bypass valve was set to minimum
>> (0.1 bar = 1m head water IIRC)
>>
>> Closing it down to 0.4 bar has jumped the differential temperature - but
>> I suspect that's too high.
>>
>> The Worcester manual says the pump can deliver 2m head for '21C
>> temperature rise' - nothing else about min flow rates or bypass pressure.
>>
>> Any ideas? If I turn it to 0.2bar the flow temperature starts to creep
>> up.
>>
>> Now this may also suggest I have the lockshields all turned down too low
>> as well (I've opened 1/4 - 3/4 turn as a starting point).
>
>
> I have mine set pretty high - based on the assumption that I only want
> it to do anything when nearly all the TRVs are closed off. A highish
> differential temperature should keep condensing efficiency up as well.
>
After balancing round 1 (a differential thermometer with 2 pipe clamps
certainly makes this quicker!), I have 10-12 across all rads more or
less at a flow to rad of 56C (boiler indicates more like 65C internal).
Fiddling with the bypass, it seems to start shunting big time at a bit
under 0.4bar - so I have set it a smidge over.
The plan is now to turn the boiler down to about 55C flow - I have
oversized the rads as far as possible with a low flow temperature (and
spare in a really cold winter) in mind.
Think I'll have to go around one more time in a couple of weeks.
Next problem - it's bloody hot upstairs and there are no radiators.
But there is about 50-70m of exposed pipework!!!
It's been quite tightly run (linked Talon clips) and I cannot get 13mm
thick insulation on it. So I'm off to peruse the Internet for either
some thinner tube, or I'll have to box it in (and be damned if the flow
heats the return a bit).
Overall - very happy. I have boiled everyone half to death running it
flat out all day. That is very nice - this house has never been this warm :)
- Danfoss Avdo 15 Auto Bypass Valve 15mm
- Honeywell Straight Auto Bypass Valve 15mm
- 15mm Auto Bypass Valve Repair Kit
- 15mm Auto Bypass Valve Gasket
B Baosity Alloy Automatic Car Bypass Valve For GOLF MK5 MK6 MK7 GTI 1.4 1.8 2.0 TFSI. The Crane Fluid Systems Dominator Z3000 flow management system for fan coils has improved on the traditional practice of connecting individual valves and pipework. The Dominator is a very compact combination of valves, incorporating a patented bypass valve unit comprising two T-ported ball valves, that dispenses with all the connecting pipework. The DU144 Automatic Bypass Valve controls the flow of water through a bypass circuit which is installed between flow and return pipework, typically at or near the boiler. Building Regulations advice states that if a bypass is installed, an automatic bypass valve must be fitted. Auto Bypass and Pressure Release Valves The Auto Bypass valve commonly sits between the flow and return pipework section of your central heating system where it can control the flow put of water whereas Pressure Release Valves (PRV) are used to prevent the build up of excessive pressure within a.
Dominator
Centre Size
80mm Centres
Temperature Rating
-10 - 120°C
End Connections
System side - BSP Female Taper Terminal side - BSP Female Taper
Please refer to Datasheet for full technical information
Dominator
Danfoss Avdo 15 Auto Bypass Valve 15mm
The Crane Fluid Systems Dominator Z3000 flow management system for fan coils has improved on the traditional practice of connecting individual valves and pipework.
The Dominator is a very compact combination of valves, incorporating a patented bypass valve unit comprising two T-ported ball valves, that dispenses with all the connecting pipework. This innovation dramatically reduces the space needed, allowing a much faster and more compact connection. There is also the added risk-free advantage of using a factory-tested component of known performance.
Honeywell Straight Auto Bypass Valve 15mm
Features & Benefits
- Flow management system for fan coil units
- Combines the essential control components and connecting pipework into one compact, fully assembled unit ready to connect
- The Z3000 is compact and lightweight
- The bypass valve unit comprises two T Ball valves
- The strainer unit has integral filter and pressure test point, plus drain cock/vent facility
- Balancing valve is of proven high quality and accuracy
15mm Auto Bypass Valve Repair Kit
Downloads
15mm Auto Bypass Valve Gasket
PN16